I would say the "Business" section is exactly for that, although it might sound formal. I don't expect we'll have big corporations in that section very soon, so it's for sure about small businesses, maybe person-to-person, even transactional, one-time kind of business.
Since we don't have a ton of activity yet, I would suggest keeping everything business under the same forum space, but if you think it's the category name itself is not very clear, I'm open to renane it 🙂